阅读说明：本技术 一种串联电阻片多腔室真空避雷器 (Multi-chamber vacuum arrester with series resistor discs ) 是由 胡松江 张明磊 张国锋 陈四甫 陈瑞斌 务孔永 陈晓朋 袁娴枚 陶黎明 邢远 李 于 2020-04-29 设计创作，主要内容包括：本发明涉及一种串联电阻片多腔室真空避雷器,包括避雷器外壳、绝缘内芯、电极组和氧化锌电阻片绝缘内芯设置在避雷器外壳内部,绝缘内芯的内部沿其中心设有柱形真空腔,电极组和氧化锌电阻片均设置在真空腔内,电极组包括上电极、下电极以及中间电极组,中间电极组设置在上电极和下电极之间,上电极与其相邻中间电极之间、下电极与其相邻中间电极之间以及相邻两个中间电极之间形成相互隔离的真空灭弧空隙。相比于现有的多腔室避雷器,本发明的避雷器具有无截波、间隙的动作特性不受环境因素影响等优势,相比于普通的氧化锌避雷器,本发明的避雷器具有通流容量大、无漏电流等优势。(The invention relates to a series resistance card multi-chamber vacuum arrester, which comprises an arrester shell, an insulating inner core, an electrode group and a zinc oxide resistance card insulating inner core, wherein the arrester shell is internally provided with the insulating inner core, the insulating inner core is internally provided with a cylindrical vacuum chamber along the center, the electrode group and the zinc oxide resistance card are both arranged in the vacuum chamber, the electrode group comprises an upper electrode, a lower electrode and a middle electrode group, the middle electrode group is arranged between the upper electrode and the lower electrode, and mutually isolated vacuum arc extinguishing gaps are formed between the upper electrode and the adjacent middle electrode, between the lower electrode and the adjacent middle electrode and between the two adjacent middle electrodes. Compared with the existing multi-chamber lightning arrester, the lightning arrester has the advantages of no cutoff wave, no influence of environmental factors on the action characteristics of gaps and the like, and compared with the common zinc oxide lightning arrester, the lightning arrester has the advantages of large through-current capacity, no leakage current and the like.)

1. The utility model provides a series resistance card multi-chamber vacuum arrester which characterized in that: the lightning arrester comprises a lightning arrester shell (1), an insulating inner core (2), an electrode group and a zinc oxide resistance card (3), wherein a plurality of insulating umbrella skirts (10) are uniformly sleeved outside the lightning arrester shell (1) from top to bottom, the insulating inner core (2) is arranged inside the lightning arrester shell (1), a cylindrical vacuum cavity (4) is arranged inside the insulating inner core (2) along the center of the insulating inner core, the electrode group and the zinc oxide resistance card (3) are arranged in the vacuum cavity (4), the electrode group comprises an upper electrode (5), a lower electrode (6) and a middle electrode group, the middle electrode group is arranged between the upper electrode (5) and the lower electrode (6), the middle electrode group comprises a plurality of middle electrodes (7) which are arranged at intervals from top to bottom, the upper electrode (5) and the lower electrode (6) are of a conical structure, and the upper electrode (5) and the lower electrode (6) are respectively arranged at the upper end and, and the pointed ends of the upper electrode (5) and the lower electrode (6) are oppositely arranged, and vacuum arc extinguishing gaps (8) which are mutually isolated are formed between the upper electrode (5) and the adjacent middle electrode (7), between the lower electrode (6) and the adjacent middle electrode (7) and between the two adjacent middle electrodes (7).

2. A series resistor disc multi-chamber vacuum arrestor as set forth in claim 1, wherein: and the outer wall of the insulating inner core (2) and the inner wall of the arrester shell (1) are provided with threads matched with each other.

3. A series resistor disc multi-chamber vacuum arrestor as set forth in claim 1, wherein: the volumes of the vacuum arc extinguishing gaps (8) are the same.

4. A series resistor disc multi-chamber vacuum arrestor as set forth in claim 1, wherein: the insulating inner core (2) is made of epoxy resin or rubber.

5. A series resistor disc multi-chamber vacuum arrestor as set forth in claim 1, wherein: the insulating inner core (2) is internally provided with reinforcing ribs which are distributed around the electrode group.

6. A series resistor disc multi-chamber vacuum arrestor as set forth in claim 1, wherein: the upper end surface and the lower end surface of the middle electrode (7) are conical surfaces.

7. A series resistor disc multi-chamber vacuum arrestor as set forth in claim 6, wherein: the zinc oxide resistance card (3) is arranged at the lower end of the vacuum cavity (4), and the upper end of the zinc oxide resistance card (3) is attached to the plane end of the lower electrode (6).

8. A series resistor disc multi-chamber vacuum arrestor as set forth in claim 1, wherein: the middle electrode (7) is divided into a mother electrode (7-1) and a sub-electrode (7-2), the mother electrode (7-1) is in a conical structure, the upper end face and the lower end face of the sub-electrode (7-2) are conical surfaces, and the middle electrode group comprises two mother electrodes (7-1) and a plurality of sub-electrodes (7-2) symmetrically arranged on the upper side and the lower side of the two mother electrodes (7-1).

9. A series resistor disc multi-chamber vacuum arrestor as set forth in claim 8, wherein: a gap is arranged between the two mother electrodes, the zinc oxide resistance chip (3) is embedded in the gap between the two mother electrodes (7-1), and the upper end face and the lower end face of the zinc oxide resistance chip (3) are respectively attached to the two mother electrodes (7-1).

Technical Field

The invention relates to the technical field of lightning protection equipment, in particular to a series resistor disc multi-chamber vacuum arrester.

Background

The lightning arrester is used for protecting various electrical equipment in an electric power system from being damaged by lightning overvoltage, operation overvoltage and power frequency transient overvoltage impact. The types of arresters are mainly protection gap, valve type arresters and zinc oxide arresters. The protective gap lightning arrester is mainly used for limiting atmospheric overvoltage and is generally used for protecting incoming line sections of power distribution systems, lines and substations. The valve type lightning arrester and the zinc oxide lightning arrester are used for protecting a substation and a power plant, are mainly used for limiting atmospheric overvoltage in a system of 500KV and below, and are also used for limiting internal overvoltage or performing backup protection on the internal overvoltage in an ultrahigh voltage system.

The existing multi-chamber lightning arrester has the following defects: 1. the chopper easily threatens the safety of the winding equipment. 2. The operating characteristics of the gap are greatly affected by environmental factors such as air humidity and air pressure. 3. Two phases operating simultaneously will produce an interphase short circuit. The existing zinc oxide lightning arrester has the following defects: 1. the through-flow capacity is small. 2. The zinc oxide resistor disc is aged quickly due to leakage current, and the aging vicious circle caused by uneven potential distribution is easily caused by the characteristic parameter difference of the series resistor disc, so that the lightning arrester is damaged finally. 3. The aging aggravation of the zinc oxide resistance card is avoided when the over-voltage of the energy infinite type is deeply inhibited.

Disclosure of Invention

The invention aims to solve the technical problem and provide a multi-chamber vacuum arrester with serially connected resistor discs.

In order to solve the technical problems, the invention adopts the technical scheme that: a series resistance card multi-chamber vacuum arrester comprises an arrester shell, an insulating inner core, an electrode group and a zinc oxide resistance card, wherein a plurality of insulating umbrella skirts are uniformly sleeved outside the arrester shell from top to bottom, the insulating inner core is arranged inside the arrester shell, a cylindrical vacuum cavity is arranged inside the insulating inner core along the center of the insulating inner core, the electrode group and the zinc oxide resistance card are both arranged in the vacuum cavity, the electrode group comprises an upper electrode, a lower electrode and a middle electrode group, the middle electrode group is arranged between the upper electrode and the lower electrode, the middle electrode group comprises a plurality of middle electrodes which are arranged from top to bottom at intervals, the upper electrode and the lower electrode are both in a conical structure, the upper electrode and the lower electrode are respectively arranged at the upper end and the lower end of the vacuum cavity, and the top electrode and the bottom electrode are arranged oppositely, and mutually isolated vacuum arc extinguishing gaps are formed between the top electrode and the adjacent middle electrode, between the bottom electrode and the adjacent middle electrode and between the two adjacent middle electrodes.

The invention relates to a series resistance card multi-chamber vacuum arrester, which is further optimized as follows: and the outer wall of the insulating inner core and the inner wall of the lightning arrester shell are provided with threads matched with each other.

The invention relates to a series resistance card multi-chamber vacuum arrester, which is further optimized as follows: the volumes of the plurality of vacuum arc extinguishing gaps are the same.

The invention relates to a series resistance card multi-chamber vacuum arrester, which is further optimized as follows: the insulating inner core is made of epoxy resin or rubber.

The invention relates to a series resistance card multi-chamber vacuum arrester, which is further optimized as follows: the insulating inner core is internally provided with reinforcing ribs which are distributed around the electrode group.

The invention relates to a series resistance card multi-chamber vacuum arrester, which is further optimized as follows: the middle electrode group comprises a plurality of sub-electrodes, and the upper end face and the lower end face of each sub-electrode are conical faces.

The invention relates to a series resistance card multi-chamber vacuum arrester, which is further optimized as follows: the zinc oxide resistance card is arranged at the lower end of the vacuum cavity, and the upper end of the zinc oxide resistance card is attached to the plane end of the lower electrode.

The invention relates to a series resistance card multi-chamber vacuum arrester, which is further optimized as follows: the middle electrode is divided into a mother electrode and a child electrode, the mother electrode is in a conical structure, the upper end face and the lower end face of the child electrode are conical surfaces, and the middle electrode group comprises two mother electrodes and a plurality of child electrodes symmetrically arranged on the upper side and the lower side of the two mother electrodes.

The invention relates to a series resistance card multi-chamber vacuum arrester, which is further optimized as follows: a gap is formed between the two female electrodes, the zinc oxide resistance chip is embedded in the gap between the two female electrodes, and the upper end face and the lower end face of the zinc oxide resistance chip are respectively attached to the two female electrodes.

The multi-chamber vacuum arrester has the following beneficial effects:

compare in current multi-chamber arrester, this structure arrester has following 3 big advantages:

1. and no chopping exists, so that the threat to the safety of winding equipment is avoided.

2. The action characteristic of the gap is not influenced by environmental factors such as air humidity and air pressure;

3. the two phases act simultaneously, so that interphase short circuit cannot be generated;

compared with the common zinc oxide lightning arrester:

this structure arrester has following 3 big advantages:

1. the through-flow capacity is large;

2. the resistor has no leakage current, delays the aging of the zinc oxide resistor disc, and avoids the damage caused by aging vicious circle due to the uneven potential distribution caused by the characteristic parameter difference of the series resistor disc.

3. The aging aggravation of the zinc oxide resistance card is avoided when the over-voltage of the energy infinite type is deeply inhibited.

Drawings

Fig. 1 is a schematic view of the external structure of a multi-chamber vacuum arrester according to the present invention;

fig. 2 is a schematic view of an external structure of the multi-chamber vacuum arrestor in example 1;

fig. 3 is a schematic view showing an external structure of a multi-chamber vacuum arrestor in example 2;

the labels in the figure are: 1. the lightning arrester comprises a lightning arrester shell, 2, an insulating inner core, 3, a zinc oxide resistance card, 4, a vacuum cavity, 5, an upper electrode, 6, a lower electrode, 7, a middle electrode, 8, a vacuum arc extinguishing gap, 9, a conducting rod, 10, an insulating umbrella skirt, 7-1, a female electrode, 7-2 and a sub-electrode.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.